Image Stabilization Apparatus with Dual Vibration Detection
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Solution Overview
Problem
Existing image stabilization systems struggle to balance vibration correction for both the main object and background during moving image shooting, particularly at close ranges or high magnification ratios, leading to image degradation due to translational shakes, which cannot be adequately detected by angular velocity sensors alone.
Innovation Solution
An image stabilization apparatus with dual vibration detection units (angular velocity and acceleration sensors) and a calculation system that adjusts translational shake correction based on the proportion of the main object in the frame, using a correction gain to balance vibration correction for both the main object and background.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If translational shake correction is strongly applied to correct the main object at close range, then the main object image blur is reduced, but the background becomes overcorrected and image quality deteriorates
Solution Approach 1:
The patent applies different correction strengths to different regions of the image. The main object region receives strong translational shake correction while the background region receives weaker correction. This is achieved by detecting the main object position and applying region-specific correction amounts, ensuring each area is optimized for its specific characteristics rather than applying uniform correction across the entire image.
2Device complexity
If only angular velocity sensor is used for vibration detection, then the device complexity is low, but translational shakes cannot be detected accurately
Solution Approach 1:
The patent combines outputs from both angular velocity sensors and acceleration sensors to detect and correct vibrations. By merging the rotational detection capability of angular velocity sensors with the translational detection capability of acceleration sensors, the system achieves comprehensive vibration detection covering both rotational and translational shakes, resolving the limitation of using only one sensor type.
3Reliability
If vibration correction is optimized for close range shooting, then the main object at 10 cm distance is well corrected, but background at 1 m distance is overcorrected
Solution Approach 1:
The patent dynamically adjusts the translational shake correction amount based on the detected main object distance. When the main object is at close range (e.g., 10 cm), stronger correction is applied to that region. When the main object is at farther distances, the correction amount is reduced. This dynamic adjustment ensures optimal correction for the main object at any distance while preventing overcorrection of the background, adapting the correction strategy to the specific shooting scenario.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate and balanced vibration correction for both the main object and background, reducing image blur and user discomfort during moving image shooting by dynamically adjusting the translational shake correction amount based on the in-focus area.
Implementation Method 1
a first vibration detection unit that detects an angular velocity of vibrations
Implementation Method 2
a second vibration detection unit that detects vibrations by using a method different from that of the first vibration detection unit
Data Source
AI summary
An image stabilization apparatus, having a vibration correction unit that corrects image blur due to vibrations, detects an angular velocity of vibrations with a first vibration detection unit, calculates a rotational shake correction amount based on an output from the first vibration detection unit, detects vibrations with a second vibration detection unit, calculates a correction value from the outputs of the first and second vibration detection units, calculates a translational shake correction amount based on the correction value and the output of the first vibration detection unit, and drives the vibration correction unit based on at least one of the rotational or translational shake correction amounts. The image stabilization apparatus changes the translational shake correction amount to a smaller value when a main object accounts for a smaller proportion of an entire screen.